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Editor’s Note: This story originally appeared on NewRetirement. On Dec. 19, 2007, Warren Buffett, chairman of Berkshire Hathaway and one of the richest men in the world, made a bet with hedge fund investor Ted Seides that an S&P 500 index fund invested for 10 years would outperform an actively managed fund over those 10 years. Without going into the details of how the contest was structured (he…